import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;

import org.jfree.chart.ChartUtilities;
import java.io.File;
import java.io.IOException;

public class Test2_1{
  public static void main(String[] args) {
    DefaultPieDataset data = new DefaultPieDataset();
    JFreeChart chart = new JFreeChart(new PiePlot(data));

    File file = new File("./test2_1.png");
    try {
      ChartUtilities.saveChartAsPNG(file, chart, 300, 300);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}